imports from libregamewiki and some cvs to git conversions

entries/ogs_mahjong.md

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+# OGS Mahjong
+
+_Simple mahjong solitaire game with 3D graphics._
+
+- Home: http://opengamestudio.org/en/game/ogs-mahjong-1.html, https://sourceforge.net/projects/osrpgcreation/
+- State: mature, inactive since 2016
+- Download: https://sourceforge.net/projects/osrpgcreation/files/Mahjong/
+- Platform: Windows, Linux
+- Keywords: puzzle, 3D, board
+- Code repository: http://hg.code.sf.net/p/osrpgcreation/code (hg)
+- Code language: C++
+- Code license: GPL-3.0
+- Code dependencies: CEGUI, Ogre3D
+
+Developer: Opensource Game Studio
+
+## Building
+
+- Build system: CMake